Marking rule



FIG. 1 is a perspective view of a marking rule showing my design;

FIG. 2 is a top plan view thereof;

FIG. 3 is a bottom plan view thereof;

FIG. 4 is a side elevational view thereof, the other side being identical; and,

FIG. 5 is a front elevational view thereof, the rear elevational view being identical. 

The ornamental design for a marking rule, as shown and described. 